Drill pipe cutter



May 19, 1931. K. MITCHELL DRILL PIPE CUTTER Filed May 2, 1930 LW n W Patented May 19, 1931 unire erstes OFFCE :DRILL rrrn CUTTER Application filed May 2,

This invention relates to improvements in drill pipe cutters and more particularly to a device for supporting a drill pipe while cutting the same for use in connection with the automatic drill pipe cutter which is the subject matter of my Patent Number 1,676,569 issued under date of July 10, 1928. The object of the invention is to provide a simple and eiiic'ent device which may be readily attached to the aforesaidautomatic drill pipe cutter in such manner that it wil support the drill pipe being cut thus removing the weight of this pipe from the cutting mechanism of the cutter.

The foregoingv and other objects together with means whereby the same may be carried into effect will best be understood from the following description of a preferred embodiment of the invention taken in connecn tion with the accompanying drawings,

wherein: v

Figure 1 is a longitudinal sectional view of a drill pipe cutter equipped with the drillV pipe supporting attachment.

Figure 2 is a plan view of the attachment alone.

Referring new more particularly to the drawings, 1 denotes a cylindrical shell connected by a coupling 2 to the operating pipe 15 which may be of any length and which is used for lowering the device into a well (not shown). A collar 4L is threaded in the upper end of the shell 1and a coiled spring 5 is secured to the upper margin of this collar. A ring 6 is secured tothe upper extremity of the spring 5 and lock prongs 7 are secured to this ring 6 as shown. The collar 4f has its inner wall beveled ofi" conically toward its lower margin as shown s-o that when the colq lar is caused to move downward into the shell 1, as will be pointed out, the bits 9 of the cutter bars 9 will be forced inward into engagement with the drill pipe 12,to sever the same as the device is rotated about the pipe. The foregoing elements are shown and described in my aforementioned patent and no invention is claimed therefor in this application.

In ycarrying out the present invention a band or collar 20: is secured by rivets 21 in the lower end of the operating pipe 15, the

1930. Serial No.

inner wall of this band 20' preferably, though not necessarily, beingbeveled conically outward from its top to its bottom towards the y walls of the said pipe 15 as shown. A supporting ring 22'is then loosely mounted on top of the band 2O to turn thereupon, this ring 22 having equally spaced grooves 28 in its inner wall to receive the aforementioned lock prongs 7 which are sprung outwardly for this purpose.y The said supporting ring fia 22 also has a plurality of equally spaced slots er recesses 241 in its upper, inner margin, which slots are disposed intermediate the aforesaid grooves 23. A plurality of supporting end by pins finger 2 s or arms 25 are pivoted at one 6 in the slots 24 and these fin.-

gers areadapted to rest against the drill pipe 12 as shown under the influence lof their own weight.

In use the device is loweredr over the drill pipe 12, the

supporting fingers 25 sliding v freely alongA the pipe and over the joint 13 thereof.

The device is then partially retracted causing the fingers 25 to engage the lower shoulde ring 22 so that when the is turned the r of the joint 18 anchoring the operating pipe 15 0' C)will not turn but said ring -u ward in the sh ell 1 forcing the bits 9 inwardy y ly. Upon continued rotation of the pipe 15v 'the drill pipe 12 will ofcourse be cut ofi'.

vt will be noted that bythe use of the supporting ring 22 and armsc25 that the weight the drill pipe being cut is not carried by the spring 5,

collar 4 and cutter barsv 9 as is the oase when the vlock prongs 7 engageV the joint 18 to operate the cutter as shown in my prior patent but that the Weight is ported upon the band 20.

`While I have herein set forthfa certain preferred embodiment of my invention, it is understood that I may vary from the same in minor details, not departing from `the spirit of the invention and within the scope of the append I claim: l 1. In a dev ed claims.

ice of the'characte'r describel7 ne Cil in combination with a drill pipe cutter including an operatingpipe and lock prongs, a band secured in the operating pipe, a snpportingl ring rotatably mounted on the said band, ineans on the said supporting band to receive the said lock prongs, and supporting fingers pivoted to the said supporting ring;

2. In a device of the character described,`

in combination with a drill pipe cutter including an operating pipe and lock prongs, a ban-d secured in the operating pipe, a snpporting ring rotatably mounted on the said band, the said supporting ring having grooves in its inner wall to receive the said lookV prongs, the said supporting ring also having a plurality of slots in its inner and upper margin, and a plurality of supporting iingers pivotally mounted in the said slots in. the supporting ring. Y

In testimony whereof I aHiX my signature.

KEARNEY IVIITCILIELL.V 

